The utility model discloses a flue gas white smoke eliminating spray tower based on a pillow plate type heat exchanger. The device comprises a tower body and a chimney, a liquid collecting tank with acooling liquid spraying function is arranged at the bottom in the tower body; the tower body is provided with a flue gas inlet above the liquid collecting tank; a pillow plate type cooler and a spraying device are arranged above the flue gas inlet in the tower body, a pillow plate type reheater is correspondingly arranged in the chimney, and the pillow plate type cooler is provided with a plurality of first pillow plate type coolers, second pillow plate type coolers and third pillow plate type coolers which are sequentially and correspondingly arranged from top to bottom. The cooler meets theheat transfer enhancement requirement, is small in resistance, and is not easy to generate dirt; the equipment operation cost is low; water consumption is reduced, and flue gas heat is recycled intoa cooling medium for reuse; the defect of white smoke plume is thoroughly eliminated; heat exchange efficiency is high, heat exchange temperature difference is small, and heat recovery rate is high; modular design and vertical installation are achieved, the structure is compact, the occupied area is small, and working condition adaptability is high.